As we mentioned in the previous article, a container is a process running on a host, and multiple containers use the operating system kernel on the same host. Here takes the Ubuntu20.04 system as an example to introduce the installation process of the Docker container engine.
- Installation dependencies.
sudo apt update sudo apt install apt-transport-https ca-certificates curl gnupg-agent software-properties-common curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
- Add software sources.
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
- Install the latest version of Docker.
sudo apt update sudo apt install docker-ce docker-ce-cli containerd.io
- Check service status
sudo systemctl status docker
Test Docker service
- Execute the following command to add the current user to the docker user group.
sudo usermod -aG docker $USER
- Log out and log in again.
- Execute the following command to run the sample container.
docker run hello-world
If the message Hello from Docker can be output, the installation is successful.